Based on the Histogram equalization theory, this paper presents a novel concept of histogram to realize the contrast enhancement of hand vein images, avoiding the lost of topological vein structure or importing the fake vein information. Firstly, we propose the concept of gray-level information histogram, the fundamental characteristic of which is that the amplitudes of the components can objec...

This paper establishes an efficient color space for the contrast enhancement of myocardial perfusion images. The effects of histogram equalization and contrast limited adaptive histogram equalization are investigated and the one which gives good enhancement results is extended to the suitable color space. The color space which gives better results is chosen experimentally. Uniqueness of this wo...

A novel Illumination based Sub-Image Histogram Equalization (ISIHE) method for contrast enhancement for low illumination gray scale images is presented in this paper. As the main crux of paper, illumination thresholds are computed and used to divide the original image into sub-images of different intensity levels. To control the enhancement rate, the histogram is clipped using a threshold value...

We evaluate the performance of an 8 × 8 array of 0.9 × 0.9 × 1 mm 3 cerium doped lutetium oxyothosilicate (LSO) crystals coupled to a position sensitive avalanche photodiode (PS-APD) as a function of bias voltage and temperature. We use this detector to develop a general methodology to optimize bias voltage, temperature, and gain for PET detectors using semiconductor photodetectors. This detect...

We demonstrate that gaps and distributional patterns embedded within real-valued measurements are inseparable biological and mechanistic information contents of the system. Such patterns are discovered through data-driven possibly gapped histogram, which further leads to the geometry-based analysis of histogram (ANOHT). Constructing a possibly gapped histogram is a complex problem of statistica...

This paper presents a novel approach called Spread Histogram for calculation of spatial relations between objects. It allows to determine such relations as INSIDE, OUTSIDE, ENCOMPASS. Additionally, the method cooperates very well with standard histogram methods like Histogram of Angles for determining the directional spatial relations.

Due to the uncertain, diverse, and light-attenuating characteristics of underwater environment, images have low contrast unclear problems. This paper proposes a histogram equalization algorithm based on optimized adaptive image quadruple segmentation cropping (AQSCHE). Compared with traditional enhancement algorithm, this introduces technology. Using exposure value point calculation formula tha...